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dodecagons books 2d shapes grids geometric means floors digital products lines mean dominos prime numbers complex numbers pentagons unit fractions balancing binary tangents trigonometry spheres cryptic clues number quadrilaterals differentiation graphs matrices palindromes planes chalkdust crossnumber angles integration elections sums medians volume bases products consecutive integers triangles time christmas albgebra consecutive numbers cubics proportion squares expansions coordinates xor factors probabilty decahedra means cryptic crossnumbers advent geometric mean cards indices routes shape the only crossnumber chocolate factorials money sum to infinity digits tournaments neighbours ellipses surds fractions polynomials integers odd numbers sport clocks games remainders square roots doubling regular shapes menace rectangles median area rugby circles symmetry addition numbers logic square grids lists sets hexagons prime factors digital clocks powers percentages dice irreducible numbers perimeter speed chess partitions crossnumbers probability parabolas pascal's triangle multiplication even numbers axes coins geometry ave functions folding tube maps polygons determinants square numbers multiples tiling combinatorics people maths taxicab geometry colouring scales sequences averages 3d shapes arrows quadratics dates star numbers gerrymandering wordplay range calculus triangle numbers multiplaction squares shapes perfect numbers division algebra crosswords cube numbers